// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <stddef.h>
#include <stdint.h>

#include <vector>

#include "base/bind.h"
#include "base/format_macros.h"
#include "base/macros.h"
#include "base/md5.h"
#include "base/message_loop/message_loop.h"
#include "base/run_loop.h"
#include "base/strings/stringprintf.h"
#include "base/sys_byteorder.h"
#include "base/threading/platform_thread.h"
#include "build/build_config.h"
#include "media/base/audio_buffer.h"
#include "media/base/audio_bus.h"
#include "media/base/audio_hash.h"
#include "media/base/decoder_buffer.h"
#include "media/base/media_util.h"
#include "media/base/test_data_util.h"
#include "media/base/test_helpers.h"
#include "media/base/timestamp_constants.h"
#include "media/ffmpeg/ffmpeg_common.h"
#include "media/filters/audio_file_reader.h"
#include "media/filters/ffmpeg_audio_decoder.h"
#include "media/filters/in_memory_url_protocol.h"
#include "media/media_features.h"
#include "testing/gtest/include/gtest/gtest.h"

#if defined(OS_ANDROID)
#include "base/android/build_info.h"
#include "media/base/android/media_codec_util.h"
#include "media/filters/android/media_codec_audio_decoder.h"
#endif

#if defined(USE_PROPRIETARY_CODECS)
#include "media/formats/mpeg/adts_stream_parser.h"
#endif

using testing::Combine;
using testing::TestWithParam;
using testing::Values;
using testing::ValuesIn;

namespace media {

namespace {

#define SKIP_TEST_IF_NOT_SUPPORTED() \
    do {                             \
        if (!IsSupported())          \
            return;                  \
    } while (0)

    // The number of packets to read and then decode from each file.
    const size_t kDecodeRuns = 3;

    enum AudioDecoderType {
        FFMPEG,
#if defined(OS_ANDROID)
        MEDIA_CODEC,
#endif
    };

    struct DecodedBufferExpectations {
        int64_t timestamp;
        int64_t duration;
        const char* hash;
    };

    struct TestParams {
        AudioCodec codec;
        const char* filename;
        const DecodedBufferExpectations* expectations;
        int first_packet_pts;
        int samples_per_second;
        ChannelLayout channel_layout;
    };

    // Tells gtest how to print our TestParams structure.
    std::ostream& operator<<(std::ostream& os, const TestParams& params)
    {
        return os << params.filename;
    }

    // Marks negative timestamp buffers for discard or transfers FFmpeg's built in
    // discard metadata in favor of setting DiscardPadding on the DecoderBuffer.
    // Allows better testing of AudioDiscardHelper usage.
    void SetDiscardPadding(AVPacket* packet,
        const scoped_refptr<DecoderBuffer> buffer,
        double samples_per_second)
    {
        // Discard negative timestamps.
        if (buffer->timestamp() + buffer->duration() < base::TimeDelta()) {
            buffer->set_discard_padding(
                std::make_pair(kInfiniteDuration, base::TimeDelta()));
            return;
        }
        if (buffer->timestamp() < base::TimeDelta()) {
            buffer->set_discard_padding(
                std::make_pair(-buffer->timestamp(), base::TimeDelta()));
            return;
        }

        // If the timestamp is positive, try to use FFmpeg's discard data.
        int skip_samples_size = 0;
        const uint32_t* skip_samples_ptr = reinterpret_cast<const uint32_t*>(av_packet_get_side_data(
            packet, AV_PKT_DATA_SKIP_SAMPLES, &skip_samples_size));
        if (skip_samples_size < 4)
            return;
        buffer->set_discard_padding(std::make_pair(
            base::TimeDelta::FromSecondsD(base::ByteSwapToLE32(*skip_samples_ptr) / samples_per_second),
            base::TimeDelta()));
    }

} // namespace

class AudioDecoderTest
    : public TestWithParam<std::tuple<AudioDecoderType, TestParams>> {
public:
    AudioDecoderTest()
        : decoder_type_(std::get<0>(GetParam()))
        , params_(std::get<1>(GetParam()))
        , pending_decode_(false)
        , pending_reset_(false)
        , last_decode_status_(DecodeStatus::DECODE_ERROR)
    {
        switch (decoder_type_) {
        case FFMPEG:
            decoder_.reset(new FFmpegAudioDecoder(message_loop_.task_runner(),
                new MediaLog()));
            break;
#if defined(OS_ANDROID)
        case MEDIA_CODEC:
            decoder_.reset(new MediaCodecAudioDecoder(message_loop_.task_runner()));
            break;
#endif
        }
    }

    virtual ~AudioDecoderTest()
    {
        EXPECT_FALSE(pending_decode_);
        EXPECT_FALSE(pending_reset_);
    }

protected:
    bool IsSupported() const
    {
#if defined(OS_ANDROID)
        if (decoder_type_ == MEDIA_CODEC) {
            if (!MediaCodecUtil::IsMediaCodecAvailable()) {
                VLOG(0) << "Could not run test - no MediaCodec on device.";
                return false;
            }
            if (params_.codec == kCodecOpus && base::android::BuildInfo::GetInstance()->sdk_int() < 21) {
                VLOG(0) << "Could not run test - Opus is not supported";
                return false;
            }
        }
#endif
        return true;
    }

    void DecodeBuffer(const scoped_refptr<DecoderBuffer>& buffer)
    {
        ASSERT_FALSE(pending_decode_);
        pending_decode_ = true;
        last_decode_status_ = DecodeStatus::DECODE_ERROR;

        base::RunLoop run_loop;
        decoder_->Decode(
            buffer, base::Bind(&AudioDecoderTest::DecodeFinished, base::Unretained(this), run_loop.QuitClosure()));
        run_loop.Run();
        ASSERT_FALSE(pending_decode_);
    }

    void SendEndOfStream() { DecodeBuffer(DecoderBuffer::CreateEOSBuffer()); }

    // Set the TestParams explicitly. Can be use to reinitialize the decoder with
    // different TestParams.
    void set_params(const TestParams& params) { params_ = params; }

    void Initialize()
    {
        // Load the test data file.
        data_ = ReadTestDataFile(params_.filename);
        protocol_.reset(
            new InMemoryUrlProtocol(data_->data(), data_->data_size(), false));
        reader_.reset(new AudioFileReader(protocol_.get()));
        ASSERT_TRUE(reader_->OpenDemuxerForTesting());

        // Load the first packet and check its timestamp.
        AVPacket packet;
        ASSERT_TRUE(reader_->ReadPacketForTesting(&packet));
        EXPECT_EQ(params_.first_packet_pts, packet.pts);
        start_timestamp_ = ConvertFromTimeBase(
            reader_->GetAVStreamForTesting()->time_base, packet.pts);

        // Seek back to the beginning.
        ASSERT_TRUE(reader_->SeekForTesting(start_timestamp_));

        AudioDecoderConfig config;
        ASSERT_TRUE(AVCodecContextToAudioDecoderConfig(
            reader_->codec_context_for_testing(), Unencrypted(), &config));

#if defined(OS_ANDROID) && defined(USE_PROPRIETARY_CODECS)
        // MEDIA_CODEC type requires config->extra_data() for AAC codec. For ADTS
        // streams we need to extract it with a separate procedure.
        if (decoder_type_ == MEDIA_CODEC && params_.codec == kCodecAAC && config.extra_data().empty()) {
            int sample_rate;
            ChannelLayout channel_layout;
            std::vector<uint8_t> extra_data;
            ASSERT_GT(ADTSStreamParser().ParseFrameHeader(
                          packet.data, packet.size, nullptr, &sample_rate,
                          &channel_layout, nullptr, nullptr, &extra_data),
                0);
            config.Initialize(kCodecAAC, kSampleFormatS16, channel_layout,
                sample_rate, extra_data, Unencrypted(),
                base::TimeDelta(), 0);
            ASSERT_FALSE(config.extra_data().empty());
        }
#endif

        av_packet_unref(&packet);

        EXPECT_EQ(params_.codec, config.codec());
        EXPECT_EQ(params_.samples_per_second, config.samples_per_second());
        EXPECT_EQ(params_.channel_layout, config.channel_layout());

        InitializeDecoder(config);
    }

    void InitializeDecoder(const AudioDecoderConfig& config)
    {
        InitializeDecoderWithResult(config, true);
    }

    void InitializeDecoderWithResult(const AudioDecoderConfig& config,
        bool success)
    {
        decoder_->Initialize(
            config, nullptr, NewExpectedBoolCB(success),
            base::Bind(&AudioDecoderTest::OnDecoderOutput, base::Unretained(this)));
        base::RunLoop().RunUntilIdle();
    }

    void Decode()
    {
        AVPacket packet;
        ASSERT_TRUE(reader_->ReadPacketForTesting(&packet));

        // Split out packet metadata before making a copy.
        av_packet_split_side_data(&packet);

        scoped_refptr<DecoderBuffer> buffer = DecoderBuffer::CopyFrom(packet.data, packet.size);
        buffer->set_timestamp(ConvertFromTimeBase(
            reader_->GetAVStreamForTesting()->time_base, packet.pts));
        buffer->set_duration(ConvertFromTimeBase(
            reader_->GetAVStreamForTesting()->time_base, packet.duration));
        if (packet.flags & AV_PKT_FLAG_KEY)
            buffer->set_is_key_frame(true);

        // Don't set discard padding for Opus, it already has discard behavior set
        // based on the codec delay in the AudioDecoderConfig.
        if (decoder_type_ == FFMPEG && params_.codec != kCodecOpus)
            SetDiscardPadding(&packet, buffer, params_.samples_per_second);

        // DecodeBuffer() shouldn't need the original packet since it uses the copy.
        av_packet_unref(&packet);
        DecodeBuffer(buffer);
    }

    void Reset()
    {
        ASSERT_FALSE(pending_reset_);
        pending_reset_ = true;
        decoder_->Reset(
            base::Bind(&AudioDecoderTest::ResetFinished, base::Unretained(this)));
        base::RunLoop().RunUntilIdle();
        ASSERT_FALSE(pending_reset_);
    }

    void Seek(base::TimeDelta seek_time)
    {
        Reset();
        decoded_audio_.clear();
        ASSERT_TRUE(reader_->SeekForTesting(seek_time));
    }

    void OnDecoderOutput(const scoped_refptr<AudioBuffer>& buffer)
    {
        EXPECT_FALSE(buffer->end_of_stream());
        decoded_audio_.push_back(buffer);
    }

    void DecodeFinished(const base::Closure& quit_closure, DecodeStatus status)
    {
        EXPECT_TRUE(pending_decode_);
        EXPECT_FALSE(pending_reset_);
        pending_decode_ = false;
        last_decode_status_ = status;
        quit_closure.Run();
    }

    void ResetFinished()
    {
        EXPECT_TRUE(pending_reset_);
        EXPECT_FALSE(pending_decode_);
        pending_reset_ = false;
    }

    // Generates an MD5 hash of the audio signal.  Should not be used for checks
    // across platforms as audio varies slightly across platforms.
    std::string GetDecodedAudioMD5(size_t i)
    {
        CHECK_LT(i, decoded_audio_.size());
        const scoped_refptr<AudioBuffer>& buffer = decoded_audio_[i];

        std::unique_ptr<AudioBus> output = AudioBus::Create(buffer->channel_count(), buffer->frame_count());
        buffer->ReadFrames(buffer->frame_count(), 0, 0, output.get());

        base::MD5Context context;
        base::MD5Init(&context);
        for (int ch = 0; ch < output->channels(); ++ch) {
            base::MD5Update(
                &context,
                base::StringPiece(reinterpret_cast<char*>(output->channel(ch)),
                    output->frames() * sizeof(*output->channel(ch))));
        }
        base::MD5Digest digest;
        base::MD5Final(&digest, &context);
        return base::MD5DigestToBase16(digest);
    }

    // Android MediaCodec returns wrong timestamps (shifted one frame forward)
    // for AAC before Android L. Skip the timestamp check in this situation.
    bool SkipBufferTimestampCheck() const
    {
#if defined(OS_ANDROID)
        return (base::android::BuildInfo::GetInstance()->sdk_int() < 21) && decoder_type_ == MEDIA_CODEC && params_.codec == kCodecAAC;
#else
        return false;
#endif
    }

    void ExpectDecodedAudio(size_t i, const std::string& exact_hash)
    {
        CHECK_LT(i, decoded_audio_.size());
        const scoped_refptr<AudioBuffer>& buffer = decoded_audio_[i];

        const DecodedBufferExpectations& sample_info = params_.expectations[i];

        // Android MediaCodec returns wrong timestamps (shifted one frame forward)
        // for AAC before Android L. Ignore sample_info.timestamp in this situation.
        if (!SkipBufferTimestampCheck())
            EXPECT_EQ(sample_info.timestamp, buffer->timestamp().InMicroseconds());
        EXPECT_EQ(sample_info.duration, buffer->duration().InMicroseconds());
        EXPECT_FALSE(buffer->end_of_stream());

        std::unique_ptr<AudioBus> output = AudioBus::Create(buffer->channel_count(), buffer->frame_count());
        buffer->ReadFrames(buffer->frame_count(), 0, 0, output.get());

        // Generate a lossy hash of the audio used for comparison across platforms.
        AudioHash audio_hash;
        audio_hash.Update(output.get(), output->frames());
        EXPECT_TRUE(audio_hash.IsEquivalent(sample_info.hash, 0.02))
            << "Audio hashes differ. Expected: " << sample_info.hash
            << " Actual: " << audio_hash.ToString();

        if (!exact_hash.empty()) {
            EXPECT_EQ(exact_hash, GetDecodedAudioMD5(i));

            // Verify different hashes are being generated.  None of our test data
            // files have audio that hashes out exactly the same.
            if (i > 0)
                EXPECT_NE(exact_hash, GetDecodedAudioMD5(i - 1));
        }
    }

    size_t decoded_audio_size() const { return decoded_audio_.size(); }
    base::TimeDelta start_timestamp() const { return start_timestamp_; }
    const scoped_refptr<AudioBuffer>& decoded_audio(size_t i)
    {
        return decoded_audio_[i];
    }
    DecodeStatus last_decode_status() const { return last_decode_status_; }

private:
    const AudioDecoderType decoder_type_;

    // Current TestParams used to initialize the test and decoder. The initial
    // valie is std::get<1>(GetParam()). Could be overridden by set_param() so
    // that the decoder can be reinitialized with different parameters.
    TestParams params_;

    base::MessageLoop message_loop_;

    scoped_refptr<DecoderBuffer> data_;
    std::unique_ptr<InMemoryUrlProtocol> protocol_;
    std::unique_ptr<AudioFileReader> reader_;

    std::unique_ptr<AudioDecoder> decoder_;
    bool pending_decode_;
    bool pending_reset_;
    DecodeStatus last_decode_status_;

    std::deque<scoped_refptr<AudioBuffer>> decoded_audio_;
    base::TimeDelta start_timestamp_;

    DISALLOW_COPY_AND_ASSIGN(AudioDecoderTest);
};

const DecodedBufferExpectations kBearOpusExpectations[] = {
    { 500, 3500, "-0.26,0.87,1.36,0.84,-0.30,-1.22," },
    { 4000, 10000, "0.09,0.23,0.21,0.03,-0.17,-0.24," },
    { 14000, 10000, "0.10,0.24,0.23,0.04,-0.14,-0.23," },
};

// Test params to test decoder reinitialization. Choose opus because it is
// supported on all platforms we test on.
const TestParams kReinitializeTestParams = {
    kCodecOpus, "bear-opus.ogg", kBearOpusExpectations,
    24, 48000, CHANNEL_LAYOUT_STEREO
};

#if defined(OS_ANDROID)
#if defined(USE_PROPRIETARY_CODECS)
const DecodedBufferExpectations kSfxAdtsMcExpectations[] = {
    { 0, 23219, "-1.80,-1.49,-0.23,1.11,1.54,-0.11," },
    { 23219, 23219, "-1.90,-1.53,-0.15,1.28,1.23,-0.33," },
    { 46439, 23219, "0.54,0.88,2.19,3.54,3.24,1.63," },
};

const DecodedBufferExpectations kHeAacMcExpectations[] = {
    { 0, 42666, "-1.76,-0.12,1.72,1.45,0.10,-1.32," },
    { 42666, 42666, "-1.78,-0.13,1.70,1.44,0.09,-1.32," },
    { 85333, 42666, "-1.78,-0.13,1.70,1.44,0.08,-1.33," },
};
#endif // defined(USE_PROPRIETARY_CODECS)

const TestParams kMediaCodecTestParams[] = {
    { kCodecOpus, "bear-opus.ogg", kBearOpusExpectations, 24, 48000,
        CHANNEL_LAYOUT_STEREO },
#if defined(USE_PROPRIETARY_CODECS)
    { kCodecAAC, "sfx.adts", kSfxAdtsMcExpectations, 0, 44100,
        CHANNEL_LAYOUT_MONO },
    { kCodecAAC, "bear-audio-implicit-he-aac-v2.aac", kHeAacMcExpectations, 0,
        24000, CHANNEL_LAYOUT_MONO },
#endif // defined(USE_PROPRIETARY_CODECS)
};

#endif // defined(OS_ANDROID)

#if defined(USE_PROPRIETARY_CODECS)
const DecodedBufferExpectations kSfxMp3Expectations[] = {
    { 0, 1065, "2.81,3.99,4.53,4.10,3.08,2.46," },
    { 1065, 26122, "-3.81,-4.14,-3.90,-3.36,-3.03,-3.23," },
    { 27188, 26122, "4.24,3.95,4.22,4.78,5.13,4.93," },
};

const DecodedBufferExpectations kSfxAdtsExpectations[] = {
    { 0, 23219, "-1.90,-1.53,-0.15,1.28,1.23,-0.33," },
    { 23219, 23219, "0.54,0.88,2.19,3.54,3.24,1.63," },
    { 46439, 23219, "1.42,1.69,2.95,4.23,4.02,2.36," },
};
#endif

const DecodedBufferExpectations kSfxFlacExpectations[] = {
    { 0, 104489, "-2.42,-1.12,0.71,1.70,1.09,-0.68," },
    { 104489, 104489, "-1.99,-0.67,1.18,2.19,1.60,-0.16," },
    { 208979, 79433, "2.84,2.70,3.23,4.06,4.59,4.44," },
};

const DecodedBufferExpectations kSfxWaveExpectations[] = {
    { 0, 23219, "-1.23,-0.87,0.47,1.85,1.88,0.29," },
    { 23219, 23219, "0.75,1.10,2.43,3.78,3.53,1.93," },
    { 46439, 23219, "1.27,1.56,2.83,4.13,3.87,2.23," },
};

const DecodedBufferExpectations kFourChannelWaveExpectations[] = {
    { 0, 11609, "-1.68,1.68,0.89,-3.45,1.52,1.15," },
    { 11609, 11609, "43.26,9.06,18.27,35.98,19.45,7.46," },
    { 23219, 11609, "36.37,9.45,16.04,27.67,18.81,10.15," },
};

const DecodedBufferExpectations kSfxOggExpectations[] = {
    { 0, 13061, "-0.33,1.25,2.86,3.26,2.09,0.14," },
    { 13061, 23219, "-2.79,-2.42,-1.06,0.33,0.93,-0.64," },
    { 36281, 23219, "-1.19,-0.80,0.57,1.97,2.08,0.51," },
};

const DecodedBufferExpectations kBearOgvExpectations[] = {
    { 0, 13061, "-1.25,0.10,2.11,2.29,1.50,-0.68," },
    { 13061, 23219, "-1.80,-1.41,-0.13,1.30,1.65,0.01," },
    { 36281, 23219, "-1.43,-1.25,0.11,1.29,1.86,0.14," },
};

#if defined(OPUS_FIXED_POINT)
const DecodedBufferExpectations kSfxOpusExpectations[] = {
    { 0, 13500, "-2.70,-1.41,-0.78,-1.27,-2.56,-3.73," },
    { 13500, 20000, "5.48,5.93,6.05,5.83,5.54,5.46," },
    { 33500, 20000, "-3.44,-3.34,-3.57,-4.11,-4.74,-5.13," },
};
#else
const DecodedBufferExpectations kSfxOpusExpectations[] = {
    { 0, 13500, "-2.70,-1.41,-0.78,-1.27,-2.56,-3.73," },
    { 13500, 20000, "5.48,5.93,6.04,5.83,5.54,5.45," },
    { 33500, 20000, "-3.45,-3.35,-3.57,-4.12,-4.74,-5.14," },
};
#endif

const TestParams kFFmpegTestParams[] = {
#if defined(USE_PROPRIETARY_CODECS)
    { kCodecMP3, "sfx.mp3", kSfxMp3Expectations, 0, 44100, CHANNEL_LAYOUT_MONO },
    { kCodecAAC, "sfx.adts", kSfxAdtsExpectations, 0, 44100,
        CHANNEL_LAYOUT_MONO },
#endif
    { kCodecFLAC, "sfx.flac", kSfxFlacExpectations, 0, 44100,
        CHANNEL_LAYOUT_MONO },
    { kCodecPCM, "sfx_f32le.wav", kSfxWaveExpectations, 0, 44100,
        CHANNEL_LAYOUT_MONO },
    { kCodecPCM, "4ch.wav", kFourChannelWaveExpectations, 0, 44100,
        CHANNEL_LAYOUT_QUAD },
    { kCodecVorbis, "sfx.ogg", kSfxOggExpectations, 0, 44100,
        CHANNEL_LAYOUT_MONO },
    // Note: bear.ogv is incorrectly muxed such that valid samples are given
    // negative timestamps, this marks them for discard per the ogg vorbis spec.
    { kCodecVorbis, "bear.ogv", kBearOgvExpectations, -704, 44100,
        CHANNEL_LAYOUT_STEREO },
    { kCodecOpus, "sfx-opus.ogg", kSfxOpusExpectations, -312, 48000,
        CHANNEL_LAYOUT_MONO },
    { kCodecOpus, "bear-opus.ogg", kBearOpusExpectations, 24, 48000,
        CHANNEL_LAYOUT_STEREO },
};

TEST_P(AudioDecoderTest, Initialize)
{
    SKIP_TEST_IF_NOT_SUPPORTED();
    ASSERT_NO_FATAL_FAILURE(Initialize());
}

TEST_P(AudioDecoderTest, Reinitialize_AfterInitialize)
{
    SKIP_TEST_IF_NOT_SUPPORTED();
    ASSERT_NO_FATAL_FAILURE(Initialize());

    // Use a different TestParams to reinitialize the decoder.
    set_params(kReinitializeTestParams);

    SKIP_TEST_IF_NOT_SUPPORTED();
    ASSERT_NO_FATAL_FAILURE(Initialize());
    Decode();
}

TEST_P(AudioDecoderTest, Reinitialize_AfterDecode)
{
    SKIP_TEST_IF_NOT_SUPPORTED();
    ASSERT_NO_FATAL_FAILURE(Initialize());
    Decode();

    // Use a different TestParams to reinitialize the decoder.
    set_params(kReinitializeTestParams);

    SKIP_TEST_IF_NOT_SUPPORTED();
    ASSERT_NO_FATAL_FAILURE(Initialize());
    Decode();
}

TEST_P(AudioDecoderTest, Reinitialize_AfterReset)
{
    SKIP_TEST_IF_NOT_SUPPORTED();
    ASSERT_NO_FATAL_FAILURE(Initialize());
    Decode();
    Reset();

    // Use a different TestParams to reinitialize the decoder.
    set_params(kReinitializeTestParams);

    SKIP_TEST_IF_NOT_SUPPORTED();
    ASSERT_NO_FATAL_FAILURE(Initialize());
    Decode();
}

// Verifies decode audio as well as the Decode() -> Reset() sequence.
TEST_P(AudioDecoderTest, ProduceAudioSamples)
{
    SKIP_TEST_IF_NOT_SUPPORTED();
    ASSERT_NO_FATAL_FAILURE(Initialize());

    // Run the test multiple times with a seek back to the beginning in between.
    std::vector<std::string> decoded_audio_md5_hashes;
    for (int i = 0; i < 2; ++i) {
        // Run decoder until we get at least |kDecodeRuns| output buffers.
        // Keeping Decode() in a loop seems to be the simplest way to guarantee that
        // the predefined number of output buffers are produced without draining
        // (i.e. decoding EOS).
        do {
            Decode();
            ASSERT_EQ(last_decode_status(), DecodeStatus::OK);
        } while (decoded_audio_size() < kDecodeRuns);

        // With MediaCodecAudioDecoder the output buffers might appear after
        // some delay. Since we keep decoding in a loop, the number of output
        // buffers when they eventually appear might exceed |kDecodeRuns|.
        ASSERT_LE(kDecodeRuns, decoded_audio_size());

        // On the first pass record the exact MD5 hash for each decoded buffer.
        if (i == 0) {
            for (size_t j = 0; j < kDecodeRuns; ++j)
                decoded_audio_md5_hashes.push_back(GetDecodedAudioMD5(j));
        }

        // On the first pass verify the basic audio hash and sample info.  On the
        // second, verify the exact MD5 sum for each packet.  It shouldn't change.
        for (size_t j = 0; j < kDecodeRuns; ++j) {
            SCOPED_TRACE(base::StringPrintf("i = %d, j = %" PRIuS, i, j));
            ExpectDecodedAudio(j, i == 0 ? "" : decoded_audio_md5_hashes[j]);
        }

        SendEndOfStream();

        // Seek back to the beginning.  Calls Reset() on the decoder.
        Seek(start_timestamp());
    }
}

TEST_P(AudioDecoderTest, Decode)
{
    SKIP_TEST_IF_NOT_SUPPORTED();
    ASSERT_NO_FATAL_FAILURE(Initialize());
    Decode();
    EXPECT_EQ(DecodeStatus::OK, last_decode_status());
}

TEST_P(AudioDecoderTest, Reset)
{
    SKIP_TEST_IF_NOT_SUPPORTED();
    ASSERT_NO_FATAL_FAILURE(Initialize());
    Reset();
}

TEST_P(AudioDecoderTest, NoTimestamp)
{
    SKIP_TEST_IF_NOT_SUPPORTED();
    ASSERT_NO_FATAL_FAILURE(Initialize());
    scoped_refptr<DecoderBuffer> buffer(new DecoderBuffer(0));
    buffer->set_timestamp(kNoTimestamp);
    DecodeBuffer(buffer);
    EXPECT_EQ(DecodeStatus::DECODE_ERROR, last_decode_status());
}

INSTANTIATE_TEST_CASE_P(FFmpeg,
    AudioDecoderTest,
    Combine(Values(FFMPEG), ValuesIn(kFFmpegTestParams)));

#if defined(OS_ANDROID)
INSTANTIATE_TEST_CASE_P(MediaCodec,
    AudioDecoderTest,
    Combine(Values(MEDIA_CODEC),
        ValuesIn(kMediaCodecTestParams)));
#endif // defined(OS_ANDROID)

} // namespace media
